QIAO Zhi,LIU Bo-zhi,HAN Zhen-yu,LAN Hai-qiang.Fracture Analysis of Bracket in an Aeroengine Lubricating Oil Tank[J].航空发动机,2021,47(5):98-102 |
Fracture Analysis of Bracket in an Aeroengine Lubricating Oil Tank |
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Key Words:failure analysis bracket fracture high-cycle fatigue deviation load finite element analysis lubricating oil tank aero⁃engine |
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Abstract:In order to analyze the fractured fault of the aeroengine lubricating oil tank’s bracket during a engine test,the fracture prop?
erty and causes of the fractured bracket were determined by the fracture analysis methods of appearance inspection,fracture analysis,com?
parative analysis of wear track,material analysis and stress distribution calculation . The analysis results shows that the fracture mode of
the bracket is high-cycle fatigue fracture. The fatigue source is located in the surface of the inner arc of the bracket’s hook.The deviation
load of bracket’s hooks appears because of the forced hooks’uncoordinated deformation caused by the cantilever structure when the tight?
ening torque is applied at the bolt. The main cause for the fatigue crack initiation is the local stress concentration of the bracket due to the
deviation load.Under the combined action of assembly stress and vibration stress during the engine test,the crack initiates and expands in
the stress concentration area,leading to the the final fracture. The suggestions for improvement about perfecting design structure and reduc?
ing the tightening torque are proposed to avoid similar events. |
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